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| author | Andrew Dunstan <andrew@dunslane.net> | 2022-03-03 13:02:53 -0500 |
|---|---|---|
| committer | Andrew Dunstan <andrew@dunslane.net> | 2022-03-28 15:37:08 -0400 |
| commit | 33a377608fc29cdd1f6b63be561eab0aee5c81f0 (patch) | |
| tree | 47abccafdaeae1c4466c917bbd85912f39558360 /src/backend/utils/adt/ruleutils.c | |
| parent | 6198420ad8a72e37f4fe4964616b17e0fd33b808 (diff) | |
| download | postgresql-33a377608fc29cdd1f6b63be561eab0aee5c81f0.tar.gz postgresql-33a377608fc29cdd1f6b63be561eab0aee5c81f0.zip | |
IS JSON predicate
This patch intrdocuces the SQL standard IS JSON predicate. It operates
on text and bytea values representing JSON as well as on the json and
jsonb types. Each test has an IS and IS NOT variant. The tests are:
IS JSON [VALUE]
IS JSON ARRAY
IS JSON OBJECT
IS JSON SCALAR
IS JSON WITH | WITHOUT UNIQUE KEYS
These are mostly self-explanatory, but note that IS JSON WITHOUT UNIQUE
KEYS is true whenever IS JSON is true, and IS JSON WITH UNIQUE KEYS is
true whenever IS JSON is true except it IS JSON OBJECT is true and there
are duplicate keys (which is never the case when applied to jsonb values).
Nikita Glukhov
Reviewers have included (in no particular order) Andres Freund, Alexander
Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zihong Yu,
Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby.
Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
Diffstat (limited to 'src/backend/utils/adt/ruleutils.c')
| -rw-r--r-- | src/backend/utils/adt/ruleutils.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c index 38da2695197..0ed774f6e66 100644 --- a/src/backend/utils/adt/ruleutils.c +++ b/src/backend/utils/adt/ruleutils.c @@ -8230,6 +8230,7 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags) case T_NullTest: case T_BooleanTest: case T_DistinctExpr: + case T_JsonIsPredicate: switch (nodeTag(parentNode)) { case T_FuncExpr: @@ -9635,6 +9636,40 @@ get_rule_expr(Node *node, deparse_context *context, get_json_constructor((JsonConstructorExpr *) node, context, false); break; + case T_JsonIsPredicate: + { + JsonIsPredicate *pred = (JsonIsPredicate *) node; + + if (!PRETTY_PAREN(context)) + appendStringInfoChar(context->buf, '('); + + get_rule_expr_paren(pred->expr, context, true, node); + + appendStringInfoString(context->buf, " IS JSON"); + + switch (pred->value_type) + { + case JS_TYPE_SCALAR: + appendStringInfoString(context->buf, " SCALAR"); + break; + case JS_TYPE_ARRAY: + appendStringInfoString(context->buf, " ARRAY"); + break; + case JS_TYPE_OBJECT: + appendStringInfoString(context->buf, " OBJECT"); + break; + default: + break; + } + + if (pred->unique_keys) + appendStringInfoString(context->buf, " WITH UNIQUE KEYS"); + + if (!PRETTY_PAREN(context)) + appendStringInfoChar(context->buf, ')'); + } + break; + case T_List: { char *sep; |